Nitro-steroids and process for their preparation

ABSTRACT

Some 7 xi -nitro-1,3,5(10)-estratrienes and a process for their preparation. The compounds inhibit gonatropin and ovulation both orally and parenterally.

1 "In H Unite States atet [151 Baldratti et al. 1 July 4, 1972 [S4] NITRO-STEROIDS AND PROCESS FOR THEIR PREPARATION [56] References Cited [72] Inventors: Giuliana Baldratti; Alberto Consonni; ()THER PUBLICATIONS Roberto Sciaky, all of Milan, Italy 0 Journal of American Chemical Soc. (1959) Vol. 8], pp. [73] Assigneez Societa Farmaceuticl ltalia, Milan, Italy 3707 3709 by Bowers et [22] Filed: June 8, 1970 E Elb b Primary xaminerert L. R0 erts [211 APP] 44,629 Att0rney-Curt M. Avery, Arthur E. Wilfond, Herbert L.

Lerner and Daniel J. Tick [30] Foreign Application Priority Data June 11, 1969 Italy ..1s045 A/69 [57] ABSTRACT Some 7-nitro-l,3,5(l0)-estratrienes and a process for their [52] US. Cl ..260/397.4, 260/397.5 preparation The compounds inhibit gonatl'opin and ovulation [51] Int. Cl ..C07c 169/32 both orally and parenterally. [58] Field of Search Machine Searched Steroids;

NlTRO-STEROIDS AND PROCESS FOR THEIR PREPARATION R O NMINOZ wherein R is selected from the group consisting of hydrogen, alkyl having from one to four carbon atoms, an (ta-halogenated alkyl radical having from one to two carbon atoms, a cycloaliphatic radical having from five to six carbon atoms, an aliphatic acyl radical having from one to four carbon atoms and a cycloaliphatic acyl radical having from five to eight carbon atoms;

R is selected from the group consisting of hydrogen, an aliphatic acyl radical having from one to four carbon atoms and a cycloaliphatic acyl radical having from five to eight carbon atoms. 30

R" is selected from the group consisting of hydrogen, ethynyl, and butynyl;

OR and R" may be together#) R is selected from the group consisting of and =0. lH iN The compounds may be prepared by a process according to 40 our invention starting from steroids wherein the A ring is aromatic and has a double bond in 6 position. More particularly,

a compound of the formula:

wherein R, R and R" have the above mentioned meaning, dissolved in a suitable solvent such as diisopropylether, dioxane and ethyl ether, is reacted with a nitrating agent selected from the group consisting of fuming nitric acid and nitrogen dioxide at a temperature of from 20 to 5 C and under anhydrous atmosphere. After neutralization of the solution, by adding sodium bicarbonate, consisting of one or more 7 g nitro-estratrienes the mixture is extracted with an organic suitable solvent such as ethyl acetate, ethyl ether and benzene and the product obtained is subsequently separated by chromatography.

The above mentioned 7-nitroestratrienes display an interesting estrogen activity and consequently may be employed to inhibit gonatropin and ovulation. One of their characteristics, which is to be emphasized, is that they are active both orally and parenterally. This property is not found in any of the estrogen steroids usually employed in therapy and particularly in those compounds lacking in the alkyl group in 17 position. The estrogenic activity has been tested in oophorectomized adult female rats by the test of the modifications of the vaginal cytology. The compound has been administered in a single dose both by the subcutaneous and oral routes.

The Table below shows the Minimum Effective Doses (MED) which represents the minimum quantity of the substance necessary to cause proestrus or estrus in one out of three animals. The Table also shows the ratio of MED by oral route to MED by subcutaneous route. In consideration of the chemical structure, the estrogenic activity of the compounds of the invention has been compared with the activity of estradiol and estron taken as standard compounds.

TABLE Estrogenic activity (MED) Lg/female rat subcutaneous oral COMPOUND cutaneous l,3,5( l0)-estratriene-3, l 7/3-diol( estradiol) 7g-nitro-l ,3 ,5 l0)-estratriene-3, l 7B-diol- 6-one 1 7-acetate 7-nitro-l,3,5( l0)-estratriene-3,6, 1 7B- triol-3, l 7-diacetate 7-nitro l ,3 ,5( l0 )-estratriene-3, l 7fi-diol- 6-one 3 l 7-diacetate 7g-nitrol ,3 ,5( l0)-estratriene-3,6, 1 7B- triol-3 l 7-diacetate- 6-nitrate 3-methoxy-7f-nitrol 3,5 l0)estratriene-6, l7B-dioll 7-acetate 3-methoxy-7E-nitrol ,3 5( l0 )-estratrienel 7,3- ol-6-one-acetate 3-methoxy-7-nitrol ,3, 5( l0)-estratriene-l 713- ol- 1 7a-ethynyl-6-one l,3,5( l0)-estratriene-3- 01- l 7-one (estrone) 7-nitrol ,3 ,5( l0 )-estratriene-3-ol-6, 1 7- dione 3-acetate 3-methoxy-7f-nitrol ,3 5( l0)-estratn'ene-6,l7- dione 3-methoxy-75-nitrol ,3 5( l0)-estratriene-6- ol- 1 7-one 3-methoxy-7g-nitro- 1 7ozethynyll ,3,5( 10 )-estratriene-l 7B-ol-6-one From the Table, it clearly appears that all the products belonging to the above mentioned class of 7-nitroestratrienes, are characterized by a ratio of estrogenic activity by oral route to estrogenic activity by subcutaneous route remarkably lower than that corresponding to estradiol and estrone which chemically are closely related compounds. This ratio is generally represented by the unity.

The following Examples serve to illustrate the invention without limiting it.

EXAMPLE 1 Nitration of 1 ,3,5( l0),6-estratetraene-3, 1 7B-diol-diacetate 600 mg of 1,3,5( l0),6-estratetraene-3,l7fl-diol-diacetate were dissolved in 20 cc of anhydrous ethyl ether. 4.5 cc of fuming nitric acid (density 1.52) were added to the solution cooled to 0 C under shaking and maintaining the temperature not above 0 C. When the nitric acid addition was over, the mixture was shaken for another 30 minutes at 0 C. The solution was neutralized with 5 percent sodium bicarbonate and the steroid was extracted with ether. The extracts were washed with 5 percent sodium bicarbonate, with water until neutrality, dried over anhydrous sodium sulfate and then evaporated to dryness. By chromatographic purification there were isolated: 7-nitro-1,3,5( l0)-estratriene-3, l 7B-diol-6-one diacetate which, on crystallization from acetone-petroleum ether, melts at 183-l86 CMELL" 255 and 305 mu; 10180 and 2.200; =l-41(CHCl 1 7-acetate EXAMPLE 2 Nitration of l,3,5( l),6-estratetraene-3-ol-l7-one acetate cc of fuming nitric acid (density 1.52) was added in minutes to 1.7 g of l,3,5( l0),6-estratetraene-3-ol-l7-one acetate in 50 cc of anhydrous ethyl ether cooled to 0 C. The solution was shaken at 0 C for minutes, poured into 5 percent sodium bicarbonate solution. The steroid is extracted with ether. The extracts were washed with water, dried over anhydrous sodium sulfate and evaporated to dryness. The residue was purified chromatographically to give: 7-nitrol',3,5( l0)-estratriene-3-ol-6,l7-dione acetate which, crystallized from acetone-ethyl ether-petroleum ether, melts at 25l-253 C, QZ'IZSS and 305 mu, 610.300 and 2.300, =+l43.6 (CHCl 7-nitro- 1 ,3,5( l0)-estratriene-3,6-dioll 7-one-3-acetate; and 7-nitrol ,3 ,5( l0 )-estratriene-3,6-dioll 7-one-3- acetate-6-nitrate.

EXAMPLE 3 Nitration of 3-Methoxy- 1 ,3,5( 10),6-estratetraene-l73-01- acetate The operation was as described in Example 2, buth employing as the starting material, 3-methoxy-l,3,5(lO),6-estratetraene-l7B-ol-acetate, melting point 99-l0l C (obtained from the reaction of l,3,5( l0),6-estratetraene-3,l7B- diol-l7-acetate with diazomethane). By chromatographic purification over Florisil (Registered Trade Mark) there were isolated: 3-methoxy--7-nitrol ,3,5( l0)-estratrienel 73-01-6- one acetate which, crystallized from acetone-ethyl etherpetroleum ether melts at l78-l80 C, 262 and 331.5 mg, 68.200 and 2.870; 3-methoxy-7-nitro-l ,3,5( l0)-estratriene-6, 1 7/3-dioll 7- acetate which when crystallized from acetone petroleum ether melts at l89-l92 C, 522 280 and 288 mu, 62.100 and 1.900 and 3-methoxy-7-nitro-l,3,5(l0)-estratriene-6,l7fldioll 7-acetate-6-nitrate.

EXAMPLE 4 Nitration of 3-methoxy- 1,3,5( l0)6-estratetraene-l7-one EXAMPLE 5 Nitration of 3-Methoxyl 7a-ethynyll ,3,5( lO),6-estratetraene- 1 73-01 4.95 cc of fuming nitric acid (density: 1.52) were added under shaking and during 10 minutes to a solution of 1.6 g of 3-methoxy-l 7a-ethynyll ,3,5( l0),6-estratetraene- 1 73-01 in 50 cc of anhydrous ether cooled to 0 C. After 10 minutes further at 0 C, the solution was poured into 300 cc of 5 percent aqueous sodium bicarbonate and then extracted with ethyl ether. The extracts were washed with water to neutrality.

After evaporation of ethyl ether the residue obtained was chromatographred on 60 g of Florist] and 3-methoxy-7if-nrtrol7a-ethynyl-l,3,5( l0)-estra-triene-l7B-ol-6-one were isolated, which after purification through silica gel and crystallization from acetone-petroleum ether melts at l08l 1 1 C; xfi', 261 (64925) and 322(l435)m/.L; IR 3420, 3300, 1700, 1565 cm; and 3-methoxy-7tf-nitrol 7a-ethynyll ,3,5( l0)-estratriene-6.f ,17/3-diol having 281 my. and a flex at 288 mp; IR 3400, 3300, 1550 cm".

We claim:

1. Nitro-steroids of the formula:

wherein R is selected from the group consisting of hydrogen, and alkyl having from one to four carbon atoms, R is selected from the group consisting of hydrogen and an aliphatic acyl radical containing from one to four carbon atoms; R" is selected from the group consisting of hydrogen, ethynyl and butynyl; OR =0; and R is selected from the group consisting 0 $01]: iONOz and =0. \g \g 2. The compound of claim 2 which is 7-nitro-l,3,5( lO)-estratriene-3 l 7/3-diol-6-one diacetate.

3. The compound of claim 2 which is 7-nitrol ,3,5( 10)-estratriene-3 ,6, l 7B-triol-3, l 7-diacetate-6-nitrate.

4. The compound of claim 2 which is 7-nitro-l,3,5( l0)-estratriene-3 ,6f, 1 7B-triol-3 l 7-diacetate.

5. The compound of claim 2 which is 7E-nitro-1 ,3,5( lO)-estratriene-B-o l -6, l 7-dione acetate.

6. The compound of claim 2 which is 7f-nitro-l ,3,5( l0)-estratriene-3, l 7B-diol-6-one l 7-acetate.

7. The compound of claim 2 which is 7f-nitro-1 ,3,5( l0)-estratriene-3 ,6-dioll 7-one-3 -acetate.

8. The compound of claim 2 which is 7-nitrol ,3,5( l0)-estratriene-3 ,6f-dioll 7-one-3-acetate-6-nitrate.

9. The compound of claim 2 which is 3-methoxy-7f-nitrol,3,5( l0)-estratrienel 7B-ol-6-one acetate.

10. The compound of claim 2 which is 3-methoxy-7g-nitrol ,3,5( l0)-estratriene-6, l 7/3-dioll 7-acetate.

l 1. The compound of claim 2 which is 3-meth0xy--7-nitrol ,3,5( lO)-estratriene-6,l 7B-dioll 7-acetate-6-nitrate.

12. The compound of claim 2 which is 3-methoxy-7-nitro- 1,3,5( 10)-estratriene-6, l 7-dione.

13. The compound of claim 2 which l,3,5( l0)-estratriene-6-oll 7-one.

14. The compound of claim 2 which is 3-methoxy-7fi-nitrol ,3,5( l0)-estratriene-6-o l l 7-one-6-nitrate.

15. The compound of claim 2 which is 3-methoxy-7-nitrol 7a-ethynyll ,3,5( l0)-estratriene- 1 713-0 1 -6-one.

16. The compound of claim 2 which is 3-methoxy-75-nitrol7a-ethynyl-l ,3,5( l0)-estratriene-6, l 7B-diol.

t t l 0' I is 3-methoxy-7f-nitro- 

2. The compound of claim 2 which is 7 xi -nitro-1,3,5(10)-estratriene-3,17 Beta -diol-6-one diacetate.
 3. The compound of claim 2 which is 7 xi -nitro-1,3,5(10)-estratriene-3,6 xi ,17 Beta -triol-3,17-diacetate-6-nitrate.
 4. The compound of claim 2 which is 7 xi -nitro-1,3,5(10)-estratriene-3,6 xi ,17 Beta -triol-3,17-diacetate.
 5. The compound of claim 2 which is 7 xi -nitro-1,3,5(10)-estratriene-3-o1-6,17-dione acetate.
 6. The compound of claim 2 which is 7 xi -nitro-1,3,5(10)-estratriene-3,17 Beta -diol-6-one 17-acetate.
 7. The compound of claim 2 which is 7 xi -nitro-1,3,5(10)-estratriene-3,6 xi -diol-17-one-3-acetate.
 8. The compound of claim 2 which is 7 xi -nitro-1,3,5(10)-estratriene-3,6 xi -diol-17-one-3-acetate-6-nitrate.
 9. The compound of claim 2 which is 3-methoxy-7 xi -nitro-1,3, 5(10)-estratriene-17 Beta -o1-6-one acetate.
 10. The compound of claim 2 which is 3-methoxy-7 xi -nitro-1,3, 5(10)-estratriene-6 xi ,17 Beta -diol-17-acetate.
 11. The compound of claim 2 which is 3-methoxy--7 xi -nitro-1,3, 5(10)-estratriene-6 xi ,17 Beta -diol-17-acetate-6-nitrate.
 12. The compound of claim 2 which is 3-methoxy-7 xi -nitro-1,3, 5(10)-estratriene-6,17-dione.
 13. The compound of claim 2 which is 3-methoxy-7 xi -nitro-1,3, 5(10)-estratriene-6 xi -o1-17-one.
 14. The compound of claim 2 which is 3-methoxy-7 xi -nitro-1,3, 5(10)-estratriene-6 xi -o1-17-one-6-NITRATE.
 15. The compound of claim 2 which is 3-methoxy-7 xi -nitro-17 Alpha -ethynyl-1,3,5(10)-estratriene-17 Beta -o1-6-one.
 16. The compound of claim 2 which is 3-methoxy-7 xi -nitro-17 Alpha -ethynyl-1,3,5(10)-estratriene-6 xi ,17 Beta -diol. 